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kernel: increase size of palloc.mem[] user page bank array

we'r hitting the limit of user page banks on some asrock mainboard,
so doubling the size of the array twice to make running out unlikely.

--- a/sys/src/9/port/portdat.h

+++ b/sys/src/9/port/portdat.h

@@ -491,7 +491,6 @@

 struct Palloc

 {

 	Lock;

-	Pallocmem	mem[4];

 	Page	*head;			/* freelist head */

 	ulong	freecount;		/* how many pages on free list now */

 	Page	*pages;			/* array of all pages */

@@ -498,6 +497,7 @@

 	ulong	user;			/* how many user pages */

 	Rendez	r;			/* Sleep for free mem */

 	QLock	pwait;			/* Queue of procs waiting for memory */

+	Pallocmem	mem[16];	/* physical user page banks */

 };

 struct Waitq